It would take about that much to be the top ranked player in the world, and I'm surprised it isn't more like 10 to 12 hours a day.

Back when I first started playing WoW, I was flabergasted with myself with how much I played the game when I checked my playtime on my first character. I had spent 15% of all the time in a 6 month period logged in. That's really quite typical for an MMO player.